Move to shoot regent in the heart (5)
I believe the answer is:
budge
'move' is the definition.
(to budge is to move slightly)
'shoot regent in the heart' is the wordplay.
'shoot' becomes 'bud' (I've seen this in another clue).
'regent in the heart' becomes 'ge' (I can't justify this - if you can you should give a lot more credence to this answer).
'bud'+'ge'='BUDGE'
'to' acts as a link.
Can you help me to learn more?
(Other definitions for budge that I've seen before include "Shift slightly, or cause to alter position" , "Move unwillingly" , "Move slightly - perhaps in opinion" , "Move however slightly" , "Shift or yield" .)